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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b86e9c3cfc9e32920f89f3df3bcb4eb65ae0fcd7c7a8efbf0c8245cefc4bffd1' 
  AND token = 'NQ0Sn1MpBQMtsO4GH/rhl5urOM2OZf9HyNRJezxxGOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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