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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb4430f6636c33bd35b307190efac2f22710b0e6848ce13cba21efa7f12fb70' 
  AND token = 'LhThXyDILk3ECR2TQQxfXi+xQcwtME1BjOEIHj1Od3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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