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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae128e344264e8a2c46e60bfd89894f863e70d89368f72dc74b0e4b884a0a87' 
  AND token = 'U3J46lTznsFwT1aYYR7/822Uo+aq4fhpZGjcQ67j+tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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