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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '118cdba42f7a25ca33349c6a52325dce90fadfae52f608a33a9ae9606fde14dd' 
  AND token = '/5tYMsy9nZL4eUqsRXbARAuWZWJcy8GHhUrIJcfiX7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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