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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c87a73c8301bd5938af4ae6e1d39047aee47478c0f9ce90fecbd6a184aafaa8' 
  AND token = 'pQuRLz1+/hFdvy05XXliKvoZAG8AG7g2J46VmAC948E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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