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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81bca77ee0fe1ff1b798e2095b2533b4e78329bffaf2467b82c8c74fdd1bc09b' 
  AND token = '1ljS5VGaqXdfYeYQEqi0HO5t5bHi3O1zume1y4UtlHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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