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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a80b63d5e0d1714ff80c731d8299b78cdf24efac0e1830aad10ad83e3fcefd0' 
  AND token = '/Ek1SfGfit9QxsIJwqK48i155RkX2hL4HQi5oejz2GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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