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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3584c6cc565f468093d161d9be6005d44e57f9353592501ff2e9f85df7741e' 
  AND token = 'Mn9OkCIYCV75JP+zkhjXsxNruB8AwrC09pphEfjuz3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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