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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e151df2c08cc1c8bc6a8bf6abbcd7379b85b230c8cc96a0a60727b6bce700716' 
  AND token = 'viHgF7UABe4aDqHMC6UGNxurbFWKt3ax0seKdA0P1Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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