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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe6a9e91fbc9baad57c1a99c8f8c376e9ed904f4f364b15f1ccd815f1250b224' 
  AND token = 'Xro0S9wlj6raT6txrN38FvZHqcEtzMYDqaGRdcl+U1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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