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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba01f66fe7e786a5aec0d9a279066505faa78581e0a3e0a2bfba03cf5e6b6b1e' 
  AND token = 'CG+JK82hO15i0G6bt/ABtVOQ4mxtjkrR+B+D4AmLyAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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