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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11eaaa78689445c1651a0f732614bb816557b8ddf0703f7102c089020049e84f' 
  AND token = 'zj5ykDLKLEvjsFJrnMTWJc4hpSaO7nZrz6Cy3FiPTiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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