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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e9ca5e92132a46ccb0ef4316e3dcb281d28da038551f530be0a63035c8c4ae' 
  AND token = 'uP0svu48vnnt6F34xAk1cPGFIv4d1yVpn2KO5pEx+P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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