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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1663fb86e533102d592637dadd7a316c4b1cbb1179c1bcd1407d38b33e9070d' 
  AND token = 'fjTF2YxBITOwV8ibj/7WcOgkgcguCOdjwP86Aj0Y2iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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