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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a627d288fab5729744060acd44dc9327a0de212708bdf13b47b3782dbbc65cff' 
  AND token = 'OEfTd6PjW+1LrG/FLenr1v2XU46fsbX+NeSr/ValfoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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