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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1432031685ee235a1c3302106890f86f7ccd148e14546032c1ca89b2a82d2a37' 
  AND token = 'n5wSWFvULr/ZOUKxn1KAZoy8btuyjiuzk9KSHYkrmoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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