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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0cc9bb5a30c5691ea73e30c5a1f5e6838500a14fc90ed6ba67fef4f7e94c73e' 
  AND token = 'a0EkNFdtLu+7hTXAwRdpqUqxqaZDEZ5O/rnNl48xzgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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