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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5dcfc8dd301e26a6396eeca3d088d6dc3df6df118223194451b0d0d44f6781a' 
  AND token = 'oJw8DDu1mfw76BX6pvwfLQDTnS4fFX2CtduGd0tUd+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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