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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be577499cca755dd60c1848a614303093975a9be46279209bab99656587a321' 
  AND token = 'Vk6pm1j2IPuVCpV/t86t5f4VO3qziViW/gWB3Obu7Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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