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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a928e6b8fd8f6c28e405d2e0c56f9cf82a082e3903ad318b8b0a807add08ef0c' 
  AND token = 'ffJFyxq0+NLJfC3doRiOAD3escAY6mKizb7xB2dLsF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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