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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f109dbeae8dde0b4824058058e214b5ac4ab1903eeaf9dd7d50a311ebc86396b' 
  AND token = 'uaDqujaVPq113PCj7tFPCA2cH3GV/rNC4NhXG8TZugU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}