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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90204d46e7fbd1f0007a7a29e5006a273e640c50ad7ccbee84ef9399e377796' 
  AND token = '/GXNIwwTnZmWgxZXu4olLNrGzZdHvUnlKqu9plnNS8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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