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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3df221d73d673a2e8d8f9bc0a5fc5e630ea4b6b1c6eb9e0a8c8136382b20199' 
  AND token = 'j/8Lg/0dwVeUr1ub7o953EmL4BFUHZHWAqG4Ii0z6LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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