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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c804d36459d7602a799e1166d213868ca2109a060a484b1a0983eac2935b9e5d' 
  AND token = 'MlA6MAx1IBXg0H54mmDuG+EmIIQsbL9FhM5ShV9GNyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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