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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5986cfd5196ce6a8a92935bcb9860c58bcbe8dd08df810f24392efb7ebefc32' 
  AND token = '7C/oXaxISFZcd6RVCY4TCNGYH+sOpaxWsTILhOMOXPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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