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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa0c58e118abc3794a14ad84e25a99fe5b6f7346b4a5517f894136eb2256196d' 
  AND token = 'kXmK1O3+ttcRM7Fj8ks6acD29+SJFdxy/GPf70ucuJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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