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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e0a551efbd96ceb78fcbf6c73e84542be0a5f89953c513e060ead94d1d347b' 
  AND token = 'AGEzLhXQcd6oCCmWBcAMw6ziU8dh+IPQ1QJBH+11U/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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