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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a7abb8b6bbc2439f1a5b971221ff8baba271214be028d9c4d29f6193ba901d3' 
  AND token = 'u1nzbI+md2l8lhS7GSTNoOXhA+Ns8b1Va00BM2K9t/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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