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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '365103de8b752062c310acd3a2550ba2f7c8829505019fa29b9a666fb54b2c26' 
  AND token = '41+o3nSFrGGWXEANXYeNDkoswmBfoODcLl4lXT4TW/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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