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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f7206ebceee4315744d71ed58e02ceebbbd8cf7a1a867ee2a8ec75207643e8' 
  AND token = '7TtozIMRqnEJQsjGyRCpoud8n8Sy/KTuOi5PUgELT34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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