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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87fd1060c72f41aae8de32f6e7608756f4e4397d4ead3f9c93cf6be4bb6d227f' 
  AND token = 'LBYEpSP9ePAAR/NxeomckMiS4Z2fXJLzODk7wDibrfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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