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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e381cf9bec82070b2f61ae25068bf4c0ffc30b161231f47b3c476d111cf2d39f' 
  AND token = 'ZqVMD6gTm6ECH3WmFFemKwsgzbqajnzn0NpZGH9P/bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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