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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff311f67e349b2aab3b551ec3fcd740566f1326e79f1e3d6a255ab7974f08055' 
  AND token = 'Gcw7lr9OfCCaOapdKCPZHGnht6aYUdbM0jsCTxWIekE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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