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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9e6dc0dba891036ca6f20b8a0deb0e4aee7ff0e29e6e1b33945944e54de3a3' 
  AND token = '//GEuWT849OTEmXdfmZKPZ8JUzn28QRrEcWQjE2ogTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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