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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91b0b2ff8681ad9c1a29edd3952320a5fc72648bc2fe5f5e30f6005f379e249' 
  AND token = 'u2woH20dPGapwGcIvqCI6N5QWoVqG2X9N6WMrb47Amw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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