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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c74928e4ecfea22ad5a8eac4333b90c5ec0dc9a8575b19b5f532047b26e4c7a' 
  AND token = 'EmLoyae3/3LkUOzOoK7N54DKdA9Wr2IkJfrJM4pHDeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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