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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7dc6c4e89bdf9201736df2214e4e4ec576943f389470982f877a17a4374256a' 
  AND token = '/0sNpstFZjVlcw7lDh/WejvWWcXP7fEfdIh7fR0cysI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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