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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c8f95798eb44ba0a5496a7c89480f6358a8b4a73d72f9be4bf8f4ea4aad25b' 
  AND token = 'rtTaJ8YncDcyyCTMe3atP0E7eZZRoBWKKS5ytYhOeUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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