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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb8b9c7c2ed9ce82e8bc25178056484951af3d13ce7a25bc919954c507b923e' 
  AND token = '1pII8hUheN+Na5STS6O7FMWvmPBXJcVZ4dYeb73KG6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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