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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026bd766724c489cc8e91fe1414f55b501a480c06eddf8f3b61009813cf1a535' 
  AND token = '3f25P+uk49rKUYMCv3zGhksgVMN9cpeoW1DEo76m4kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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