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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f5f7ba5483fe784d705f709ddfce2d0ed4c8f113d11ab2ab28dcb495ace550' 
  AND token = 'JiwvRfbRA7uJpv4njdt6z0ED24A7gEstNDA42PRNj9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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