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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e356f185974dd733f0f3cb003210d71ac259e1b2e4128a9384974f8e23ceb8' 
  AND token = 'cV5jURbxOPiCJ74eNRKcN0Meyn8tSLJv3tpsIMyk1kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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