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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011f5ee8bd166467d8bd55a5d2f250f7c884d49d9943f0ef2164c038eb4a5e86' 
  AND token = 'uh29oLNs2O7O8KIejL/aMeB0LhTHWwchUJJaqP0mPdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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