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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58704d9017b59c467515f52db0312c1d18c93483bf4bb6ce05db948546ce7bbb' 
  AND token = 'wvU1+kbGjsEsZQ2sQuSXA0BDmTCQ0VuNsxQvUkKsX2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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