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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41cc70982a15c56fa3e458404331c2b343b3c9fc57e226da8b8a6d5a7fe52b55' 
  AND token = 'N3dAxBoftirb48uUmvx27J7Jar98s1XKB+PV6sPAq38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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