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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afdb142293d9961beb083bf2117215afe04d3227aa753dae54d2225ce0ae93e8' 
  AND token = 'gqSd9vfilssowARr2oxYvIoJXaSv1j7PMXyyZKe/M1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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