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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2066f8db272bee5c6061c20d7c009fdbf1c9e18c72db412fb5ac0aad70336b7b' 
  AND token = 'n11+r7s50PYb7xBj8g+JNAZLztQUU0clAKC+Qo6IA/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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