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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87cbb97110ab8f6eec67c7f9d5bfe5ddaea6284a87f0bece66a91e01cc2005b4' 
  AND token = 'tefefkDZtmiy+pdqtHsCBVi0tF99VHvl+EGqfEXOWgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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