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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9652cd26c32b3045c17994927367e428233f4b02c4a85ab51bd4717cff996b2e' 
  AND token = 'LiaLccsewGq2tlE2vzzUXh4keAdXi+1bkidn/Rt/Oxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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