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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce2aa527c1c28e24c29d120a47b160f95dace4c3e3bc7ca0f4f0b129625e6b24' 
  AND token = 'BGFNlU3ctDuM04H4/MnyQ6GuSKXEiFFKwKpGn4emZ9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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