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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970ce6a189c936fc543f0de7218b209c53a3a29e4458459f687b77ba9ba86411' 
  AND token = 'mdscY1LIG4g0iv2vTDXm4sprdGE2aoy4JTSaGunA4Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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