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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb7e5b5a4be8232e290b0bb126a666bc9d094625c29fccce9bd9eb5f56f988d' 
  AND token = 'cSdVmMLlLPdQDv3UQHveN3OCS0BcxufkAROHmzgcs4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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