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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceef0d51b00510ea0fc2ad0f70dd1d7bc8f7d189e2822c973c37a90201bd1671' 
  AND token = 'oYo+oFWT8IMdXqEjLQU44xNtNVTwAQn6CeU56D6XZUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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