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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b81db1da1f687dc0071137b3f2d27dc79e9c75e7462f50e0dcf77e5806d17b0e' 
  AND token = 'z4TqI3bjamgDunYju7FTIMg/Bun3dyNtGVXMD62+vbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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